MISSING AND SPUTTERRING

I WAS DRIVING TO WORK AND THE CAR STARTED TO RUN FUNNY IT WAS SPITTING AND SPUTTERRING LIKE IT WAS MISFIRING BUT I CHANGED THE WIRES AND SPARK PLUGS AND IT REALLY DIDN'T MAKE A DIFFERENCE THEN IT ALSO WOULDN'T GO MORE THEN 35 MPH AND MISSING ALL THE WAY I WAS TALKING TO A PERSON THAT KNOWS A LITTLE MORE THEN I KNOW AND JUST EXPLAINED WHAT IT WAS DOING AND SAID IT WAS PROBABLY THE CATALATIC CONVERTER COULD THIS POSSIBLY BE THE PROBLEM> PLEASE LET ME KNOW AND EMAIL ME BACK ASAP